Preheat oven to 300°. Combine the flour, pumpkin pie spice and baking soda in a mixing bowl; set aside. In a stand mixer, cream butter and sugar together. Add the eggs and vanilla and beat for about 30 seconds, then add the flour mixture 1/2 cup at a time until thoroughly incorporated.

Drop by rounded tablespoons on an ungreased cookie sheet and bake for 15-20 minutes, until set. Immediately top each cookie with a kiss.